nl80211: add generation number to all dumps
In order for userspace to be able to figure out whether
it obtained a consistent snapshot of data or not when
using netlink dumps, we need to have a generation number
in each dump message that indicates whether the list has
changed or not -- its value is arbitrary.
This patch adds such a number to all dumps, this needs
some mac80211 involvement to keep track of a generation
number to start with when adding/removing mesh paths or
stations.
The wiphy and netdev lists can be fully handled within
cfg80211, of course, but generation numbers need to be
stored there as well.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index a360bce..eec0014 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -349,6 +349,7 @@
goto out_free;
}
list_add(&sta->list, &local->sta_list);
+ local->sta_generation++;
local->num_sta++;
sta_info_hash_add(local, sta);
@@ -485,6 +486,7 @@
}
local->num_sta--;
+ local->sta_generation++;
if (local->ops->sta_notify) {
if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)